Programmatically enable Enterprise keywords in SharePoint 2010

Article

Introduction:

Enterprise keywords are used to tag the documents when uploading the documents in the document library. Enterprise documents can be enabled in both SharePoint lists and libraries. Enterprise keywords - Terms are stored in a non-hierarchical way and available for users to key in which is known as folksonomy (free tagging). In this article we will be seeing how to enable Enterprise keywords for a list using SharePoint object model.

Prerequisites:

Managed metadata service application should be configured.
Web application should be associated to the Managed Metadata Service Application.

Programmatically Enable Enterprise Keywords:

To enable Enterprise keywords through UI refer http://www.c-sharpcorner.com/UploadFile/anavijai/7633.

To enable enterprise keywords using object model do the following steps:

Open Visual Studio 2010.
Go to File => New => Project.
Select Console Application template from the installed templates.
Add the following references.

Microsoft.SharePoint
Add the following namespaces.

using Microsoft.SharePoint;
Replace Program.cs with the following code.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.SharePoint;
namespace EnterpriseKeywords
{
  class Program
  {
  static void Main(string[] args)
  {
  using (SPSite site = new SPSite("http://serverName:22222/sites/Test/"))
  {
  using (SPWeb web = site.OpenWeb("BL"))
  {
  SPList list = web.Lists.TryGetList("dl");
  if (list != null)
                    {
  SPField field = list.ParentWeb.AvailableFields["Enterprise Keywords"];
  if (!list.Fields.ContainsField("Enterprise Keywords"))
  {
  list.Fields.Add(field);
  list.Update();
  Console.WriteLine(field.Title + " added successfully to the list");
  }
  else
  {
                  Console.WriteLine(field.Title + " column already exists in the list");
  }
  }
  else
  {
  Console.WriteLine(list.Title + " does not exists in the site");
  }
  Console.ReadLine();
  }
  }
  }
  }
}
Build the solution.
Hit F5.
Go to the =>Permissions and Management => Enterprise Metadata and Keywords Settings.
You could see the "Enterprise Keywords" enabled.